Methods described herein may be useful in the fabrication and/or screening of devices (e.g., sensors, circuits, etc.) including conductive materials. In some embodiments, a conductive material is formed on a substrate using mechanical abrasion. The methods described herein may be useful in fabricating sensors, circuits, tags for remotely-monitored sensors or human/object labeling and tracking, among other devices. In some cases, devices for determining analytes are also provided.